add types for lisp primitives and functions

1 files changed, 9 insertions, 6 deletions

diff --git a/src/lisp/mod.rs b/src/lisp/mod.rs
index b863bba..5166a04 100644
--- a/src/lisp/mod.rs
+++ b/src/lisp/mod.rs
@@ -1,9 +1,12 @@
-mod error;
-mod expr;
-mod lex;
-mod number;
-mod parse;
+pub mod env;
+pub mod error;
+pub mod expr;
+pub mod lex;
+pub mod number;
+pub mod parse;
+
+use std::collections::HashMap;
 
 use expr::LispExpr;
 
-pub type Environment = Vec<(String, LispExpr)>;
+pub type Environment = HashMap<String, LispExpr>;